Boiler Controls - Evo HE C22/24 User Manual

Summer conditions - i.e. DHW only required.
Set the thermostat knob to OFF.
The boiler will fire periodically for a few seconds to maintain the
DHW calorifier in a preheated condition. The average time
period between firing is 90 minutes. This may vary considerably
due to the surrounding ambient temperature of the boiler. The
boiler will fire whenever there is a demand for DHW.
Note. The pump will operate briefly as a self-check once every
24 hours, regardless of system demand.
Control of water temperature
Domestic Hot Water
The DHW temperature is limited by the boiler controls to 65
maximum at low draw-off rate, adjustable via the DHW
thermostat knob (J).
Due to system variations and seasonal temperature fluctuations
DHW flow rates/temperature rise will vary, requiring adjustment
at the draw off tap : the lower the rate the higher the temperature,
and vice versa.
Central Heating
The boiler controls the central heating radiator temperature to a
o
maximum of 82 C, adjustable via the CH thermostat knob (F).
Approx. flow temperatures for the boiler thermostat settings are:
Knob Setting
Minimum
Maximum
To shut down the boiler
1. For short periods
Set the mains ON/OFF switch (A) to OFF
2. For longer periods
Set the mains ON/OFF switch (A) to OFF, and switch the
electricity supply to OFF. For longer periods the entire system
should be drained.
To relight the boiler
Repeat the procedure detailed in 'To light the boiler'.
Frost protection
If no frost protection is provided and frost is likely during a short
absence from home, leave the heating controls (if fitted) at a
reduced temperature setting. For longer periods, the entire
system should be drained.
If the system includes a frost thermostat then, during cold
weather, the boiler should be turned OFF at the time switch (if
fitted) ONLY. The mains supply should be left switched ON, with
the boiler thermostat left in the normal running position.
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BOILER CONTROLS

Legend
A. Boiler ON/OFF switch.
C. Display.
D. Reset button.
E. LED.
CAUTION. To avoid the possibility of injury during the installation, servicing or cleaning of
this appliance care should be taken when handling edges of sheet steel components.
evo HE C -
User's
Flow Temperature
o o
C F
30 86
82 180
F. CH thermostat knob.
G. Condensate drain.
H. Pressure gauge.
J. DHW thermostat knob.
Boiler overheat thermostat
This thermostat will shut down the boiler in the event of
overheating. Should this occur a fault code
displayed. Press the reset button (D) and the boiler will relight.
If the fault recurs, turn off the boiler and consult a Gas Safe
Registered Engineer or in IE a Registered Gas Installer (RGII).
Flame failure
Should this occur a fault code
Press the rest button (D) and the boiler will relight.
If the fault recurs, turns off the boiler and consult a Gas Safe
Registered Engineer or in IE a Registered Gas Installer (RGII).
Loss of system water pressure
o
C
The gauge (H) indicates the central heating system pressure. If
the pressure is seen to fall below the original installation pressure
of 1-2 bar over a period of time then a water leak may be
indicated. In this event conduct the re-pressurising procedure
(see Trouble Shooting - Problem 4). If unable to do so or if the
pressure continues to drop a Gas Safe Registered Engineer or
in IE a Registered Gas Installer (RGII) should be consulted.
DO NOT FIRE THE BOILER IF THE PRESSURE HAS
REDUCED TO ZERO FROM THE ORIGINAL SETTING.
Condensate Drain
The condensate drain (G) must not be modified or blocked.
Blockage of the condensate drain, caused by debris or freezing,
can cause automatic shutdown of the boiler.
If freezing is suspected and the pipe run is accessible an attempt
may be made to free the obstruction by pouring hot water over
the exposed pipe and clearing any blockage from the end of the
pipe. If this fails to remedy the problem the assistance of a Gas
Safe Registered Engineer or in IE a Registered Gas Installer
(RGII) should be sought.
Escape of gas
Should a gas leak or fault be suspected contact the National Gas
Emergency Service without delay. Telephone 0800 111 999
Do NOT search for gas leaks with a naked flame.
Cleaning
For normal cleaning simply dust with a dry cloth.
To remove stubborn marks and stains, wipe with a damp cloth
and finish off with a dry cloth.
DO NOT use abrasive cleaning materials.
Maintenance
The appliance should be serviced at least once a year by a Gas
Safe Registered Engineer or in IE a Registered Gas Installer
(RGII).
or will be
will be displayed.
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